Engine-valve.



G. P. ABORN.

ENGINE VALVE.

APPLIoATIoN FILED Nov. e. 1912.

1,102, 181 Patented June 30,1914.

l Imm?! KNOWL-.ES STEAM PUMP WORKS,

ENGINE-VALVE.

To all whom t may concern Re it known that I, Geenen P. ABORN, a citizen of the United States, residing at Brookline, county of Norfolk and State of h/lassaehusetts, have invented certain new and useful Improvements in Engine-Valves, :fully described lowing specifica drawings, forming a part of the same.

This invention relates to steam engines and pumps equipped with fluid actuated valves.

The object of the invention `is to provide a simple and compact valve .mechanism for working the steam expansively; and, when used in steam pumps, to slow down the piston stroke near its end to allow the valves in the pump cylinder to seat quietly and with little shock, and to secure an easy reversal of the piston stroke.

`In the drawings, Figure l is a section longitudinally of the steam cylinder' and on the line of the valve rod. Fig. 2 is a section transverse to the cylinder. Fig. 3 is a sectional plan of the auxiliary cylinder and valve yoke, taken on the line 3--3 of Fig. 1, and Fig. 4 is a plan view of the valve seat on the steam cylinder showing port connections.

Tlie main cylinder is indicated at 10, and in Fig. l, the main piston is partly shown at 11. The main valve seat 12, as shown in Figs; l and 4, is equipped with three main ports, 13 and 14 being the inlet channels and 15 the exhaust. The main slide valve 16 is moved in part by the valve rod 22 and in part by the auxiliary piston 17 inclosed in the auxiliary steam cylinder 18. The cylinder 18 is in axial parallelism with the main cylinder which it surmounts, but this arrangement, though preferred in the present instance, is not essential to the carrying out of theinvention. The valve rod 22 carries a yoke 21 to which are attached an auxiliary valve 19 on one side of the yoke, and a cutoff valve 2O on the other side of the yoke. The auxiliary valve controls the admission of steam to the auxiliary cylinder; the cutol' valve controls the admission of steam to the main steam valve. The main valve is formed with a vertical lug which engages a recess in the auxiliary piston so that the valve and auxiliary piston move together. This lug passes through the valve yoke 21, as best shown in Fig. 3, the dimensions be- Speciflcation of Letters Patent. Application filed November 6,1912.

and represented in the aol- I tlon and the accompanying fined between its Patented June 30, 191 4. serial No. 729,739.

ing such that there is lost motion between the yoke and the main valve.

s shown in Fig. 4, the main valve seat is equipped with five ports; cut-ott' ports 2 and 2G and ports 13, 14 and 15 previoush7 described.` rlhe openings 37 and 38 are for the admission of steam into the auxiliar-v steam chest.

The described mechanism operates as follows: Stean enters at opening 40 and passes into the auxiliary chest through passages 3T and 38. Assuming the auxiliary piston 17, as viewed in Fig. 1, to be in its extreme lefthand position, being so held by steam admitted to the right of the piston by ports 29 and 33 as shown in Fig. 3; the main valve 16 will also be in a similar position and will allow steam to pass through ports 23 and 25 to cavity 36 in main valve 1,6, then through port14 into main cylinder 10, causing the piston 11 to move to the left. At the same time steamwill exhaust through port 13, port 15, and exhaust outlet 41. At a predetermined point :in the travel of the main piston 1l, the usual tappet gear (not shown) will move the valve rod 22 to the right. The valve rod will carry with it the yoke 21,the auxiliary `valve 19 and the cut-oll" valve 20. The movement of the auxiliar-y valve 19 to the right lirst uncovers port 2T Fig. 3) and closes exhaust port 28, admitting' steam at the le'tt oi auxiliary piston 17 t rough port which balances the piston.y as ports 29 and 33 at the opposite end are still open to the steam pressure. The con* tinued movement of the yoke 2l carries the cut-oil valve over the port 23, thus cutting oil the supply of steam to the main steam valve, the stroke of the main steam piston being completed by expansion ol the steam previously admitted to the evlimler. lVhen the lost motion between, the valve yoke and the main steam valve is taken up, the main valve is also moved to the right until just before it reaches its central position, at which point the auxiliary valve 19 will have moved far enough to have opened port to exhaust and closed port 29 to steam. The auxiliary piston is thereby thrown out of balance and is driven over to the right until it cushions on the steam couend and the cylinder headv due to the covering of exhaust port 32 by the piston. The main valve will now be in a position for the return stroke of the main piston 11. When it is desired to have the steam follow full stroke, as in warming up,

either one or bothof'the bleeder valves 4Z, 43 covering" the ports 44 and 45 ymay be opened. These valves admit steam through ports 44 and 45 to the main slidevalve through which it may pass into the main cylinder independently ofthe cut-off ar-y rangement.

The construction as thus shown-and described is the preferred embodiment of the invention', but it'will be understood that the invention is not limited to the specific arrangement of parts illustrated, 'but that the broader features `of the invention, as definedby the claims, may be embodied in other constructions. l

What is'clainied is 1. ln combination, a main slide valve, fluid actuated `means adapted partially to control said valve, an auxiliary valve controlling the fluid actuated means, a cut-off. valve, and av valve rod 'moving the Ymain slidevalve, the auxiliary valve and the cutoff valve. l n

2. In combination, a main slide valve, fluid actuated'means and a valve rod'operating liointly to control the said slide valve, auxiliary ports in communication wi h vthe fluid actuated means, cutofl', ports yin communi cation with the main slidevalve, anda valve mechanism operated by thesaidv valve rod to control the 'said auxiliary and' cuto ports. i 'y V 3. In combination, a main slide valvey fluid actuated'ineans and a valve rodto move said valve,v an auxiliary valve controlling the movement of the fluid actuated means, a cut-off valve adapted to limit the supply of fluidto the main slide valve, the saidv valve rod controlling the movements of the said auxiliary'andv 'cut-off.' valves.

4. In combination,a main cylinder,-a main slide valve, a valve rod, anV auxiliarycylinder,anauxiliary piston located within'the auxiliary cylinder, the said piston and said valve rod operating,` j'ointlyto contol Athe main slide valve, a ciit-offvalve adapted yto control the movement of fluid to the main slide valve, and means to pass the 'liuid to the main slide valve independently of lthe said eut-off valve.

5. In combination,

a main slide valve,

Copiea of this patent may be obtained for ve cents each,

fluid actuated means and a valve rod to move the said valve, a second valve device equipped with ports to control the said fluid actuated means and withport-s to limit the supply of fluid to the main slide valve, the said Second valve device being located be` tween the said main slide valve and the fluid. actuatedmeans. i

6. ln combination, a fluid actuated valve gear including an auxiliary cylinder and an auxiliary piston, a valve rod, a main slide valve attached to 'said piston and moved. by the piston and by the valve rod, anda valve device combining auxiliary and cut-off ports and mounted above the main slide valve and 'below the said piston an movable independently of said piston.

7. ln combination, a main slide valve, fluid actuated means and a valve rod operatingjointly to move said valve, a'secon valve device equipped with ports to control thesaid vfluid actuated means' and with ports to limit the supply of fluid to the main slide valve, and means to supply uid to the main slide valve independently of said limiting` ports.

8.111 combination, the main valve, a piston connected with the said'valve to move it, a cylinder in which said piston is lo Y a cut-olf valve cated, an auxiliary valve and both interposed between said cylinder and the seatfor the main valve, the auxiliary valve controlling the passage of fluid in the said cylinder and the cut-off valve controlling the supply of fluid to the said main valve, a carrier for the said auxiliary'an cutfofi1 valves havingan opening through which the stem of the main valve is extended, and a valve rod attached to the carrier.

9. In combination. the main slide valve 16, attached to auxiliary piston 17, the valve yoke Q1 equipped with valves 19 and 20 and adapted to move the main valve 1G intermittently, substantially as shown and described. s

in testimony whereof, I have hereunto set my hand, in the presence of txvosubscribing witnesses.-

GERGE P. ABORN. Vitnesses CHAS. Gr. CHAPMAN, Jol-1N J. FINLnv.

by addressing the Commissioner of atents,

Waahington, 3D. G. 

